Write a tool to manipulate MSF files.

[sebmarchand]

It'd be useful to have a small tool to manipulate the streams any MSF file (PDB, PGD...). This tool should offer the following options:

• List all the streams in a MSF file.
• Extract/explode all the streams from a MSF file into a given directory.
• Remove a stream from a MSF file.
• Add a stream to a MSF file.
• Replace one of the stream contained in a MSF file by another one (from another file).